

def sum1(start,stop):
    sum1 = 0
    for a in range(start, stop+1):
        sum1 += a
    return sum1


# print(sum1(1,100)/100)
# 1.定义一个函数my_func(),函数执行结果为输出10行”hello world”
def my_func():
    print("hello world\n"*10)   # \n 换行符  \t 空格
# print(my_func()*10,end="\n")
my_func()